CN1613207B - Radio control apparatus, mobile communication method and mobile communication system - Google Patents

Abstract

Radio control apparatus, mobile communication method, mobile communication program and mobile communication system are provided. A radio control apparatus 2 has a transmission speed control section 23 and a memory section 22. The transmission speed control section 23 calculates the transmission power of a data signal to be transmitted to a cell phone 41 based on the transmission power of a control signal to be transmitted to the cell phone 41 and an offset value to be applied to the transmission power of the control signal. The transmission speed control section 23 compares the transmission power of the data signal with an upper limit value stored in the memory section 22, and performs control to decrease the transmission speed of the data signal when the transmission power of the data signal is greater than the upper limit value and to increase the transmission speed of the data signal when the transmission power of the data signal is less than or equal to the upper limit value.

Description

Wireless control device, mobile communication method, and mobile communication system

technical field

The present invention relates to a wireless control device, a mobile communication method, a mobile communication program and a mobile communication system.

Background technique

In recent years, with the development of wireless communication technology, mobile communication systems capable of high-speed and highly reliable data transfer have become available. In particular, in mobile packet communication systems using code division multiplexing methods such as W-CDMA (Wideband-Code Division Multiple Access) and CDMA-2000, as the transmission method in the downlink direction, the transmission method based on the characteristics of the signal sent to the mobile communication terminal is adopted. Techniques that use communication channels separately.

For transmission of control signals, A-DPCH (Associated-Dedicated Physical Channel) is used as a dedicated channel (channel dedicated to each terminal) in the downlink direction, which is suitable for high-speed transmission power control. In contrast, in the transmission of data signals, time-division multiplex communication is performed using DSCH (Downlink Shared Channel), which is a shared channel that can efficiently use radio resources between multiple mobile communication terminals. In this way, the channels used are appropriately switched according to the signal properties, and efficient signal transmission is performed that complements the advantages of both channels.

Contents of the invention

However, the above-mentioned prior art has various problems as follows. That is, in a mobile communication system using a code division multiplexing method, services are provided in all cells using the same frequency band. Therefore, data communicated in various services such as voice calls, ISDN (Integrated Services Digital Network, Integrated Services Digital Network) and other services such as circuit switching services and packet switching services are mixed on the same frequency band. In order to cope with such a communication form, the upper limit value of transmission power is set not only for each base station but also for each service.

For example, considering such a situation, assuming that the total transmission power that the base station can allocate to the mobile communication terminal is 100, the transmission power used in the circuit switching service is set to 60 in the cell with many users making voice calls. , set the transmit power used in the packet-switched service to 40. Conversely, in a cell with many users performing data transfer, the transmission power used for the circuit switching service is set to 20, and the transmission power used for the packet switching service is set to 80.

In this way, the upper limit value of the transmission power changes over time according to the cell where the mobile communication terminal is located and the utilization status of the service, and the usable transmission power is limited. On the other hand, in DSCH, although the transmission rate can be changed every certain period of time (for example, 10 ms) in the standard specification, since the method is not established, a fixed transmission rate (for example, 384 kbps) is set at the start of data transmission.

Therefore, data may be transmitted and received at a transmission speed unsuitable for power transmission. Specifically, when the transmission speed is higher than the transmission speed suitable for transmission power, sufficient transmission power cannot be supplied for DSCH, and the communication quality of data deteriorates. Conversely, when the transmission speed is lower than the transmission speed suitable for power transmission, although data transmission can be performed at a higher speed, data communication is still performed at a low transmission speed.

The present invention is proposed to solve the above problems, and its object is to provide a wireless control device, a mobile communication method, a mobile communication program, and a wireless control device, a mobile communication method, and a mobile communication program that realize high-speed data communication while suppressing communication quality degradation by controlling the transmission speed according to the transmission power. mobile communication system.

A wireless control device for general control of packet communication between a public base station and a mobile terminal according to the present invention is characterized in that it includes: a first storage unit, for each of a plurality of mobile communication terminals, storing information sent to the mobile communication terminal The transmission power of the control signal and the offset value added to the transmission power of the mobile communication terminal; the calculation means acquires the control signal transmitted to the specific mobile communication terminal from the first storage means among the plurality of mobile communication terminals. The transmission power of the signal and the offset value added to the transmission power of the control signal, based on the obtained transmission power and the offset value, calculate the transmission power of the data signal transmitted to the above-mentioned specific mobile communication terminal; the second storage means for storing the transmission power upper limit value of the data signal; a comparison means for comparing the transmission power of the data signal calculated by the calculation means with the upper limit value stored in the second storage means; and the control means, according to According to the comparison result of the comparison means, the following control is performed: when the transmission power of the data signal is larger than the upper limit value, the transmission speed of the data signal is reduced, and when the transmission power of the data signal is smaller than the upper limit value In the case of increasing the transmission speed of the above-mentioned data signal.

A mobile communication method of the present invention performed by a wireless control device that generally controls packet communication between public base stations and mobile terminals is characterized in that it includes: a first storage step, for each of a plurality of mobile communication terminals, the above-mentioned wireless The control device stores the transmission power of the control signal sent to the mobile communication terminal and the offset value added to the transmission power of the mobile communication terminal in the first storage unit of the wireless control device; In the mobile communication terminal, the wireless control device acquires the transmission power of the control signal transmitted to the specific mobile communication terminal and an offset value added to the transmission power of the control signal from the first storage unit, and based on the acquired transmission power and the offset value, the above-mentioned wireless control device calculates the transmission power of the data signal transmitted to the above-mentioned specific mobile communication terminal; the second storage step, the above-mentioned wireless control device stores the above-mentioned data signal in the second storage part of the wireless control device the transmission power upper limit value; the comparison step, the wireless control device compares the transmission power of the data signal calculated in the calculation step with the upper limit value stored in the second storage unit; and the control step, according to the above-mentioned As a result of the comparison in the comparing step, the radio control device lowers the transmission speed of the data signal when the transmission power of the data signal is greater than the upper limit value, and lowers the transmission speed of the data signal when the transmission power of the data signal is greater than the upper limit value. If it is smaller, control is performed to increase the transmission speed of the above-mentioned data signal.

The mobile communication program of the present invention uses an independent channel to send a control signal to each of a plurality of mobile communication terminals, and uses a shared channel to send data signals in a time-sharing manner between a plurality of mobile communication terminals, thereby being used to control the mobile communication terminal A mobile communication program for downlink packet communication with a base station, characterized by including: causing a computer to execute processing based on the transmission power and the control signal transmitted to a specific mobile communication terminal among the plurality of mobile communication terminals The offset value added to the transmission power of the control signal, the calculation process of calculating the transmission power of the data signal sent to the specific mobile communication terminal; the storage process of storing the upper limit value of the transmission power of the data signal in the storage unit; comparison processing of comparing the transmission power of the data signal calculated in the above-mentioned calculation step with the above-mentioned upper limit value stored in the above-mentioned storage means; If the value is larger, the transmission speed of the data signal is lowered, and when the transmission power of the data signal is lower than the upper limit value, the transmission speed of the data signal is increased.

According to these inventions, according to the transmission power of the control signal transmitted to each of the plurality of mobile communication terminals using an independent channel, the transmission speed of the data signal that is time-divisionally transmitted using a shared channel between a plurality of mobile communication terminals is dynamically controlled .That is, when the transmission power of the data signal is greater than the upper limit, the transmission speed of the data signal is controlled to be reduced. Through this control, sufficient transmission power suitable for the transmission speed can be supplied to the DSCH, and the communication quality of the data can be improved. As a result, the retransmission rate due to transmission errors and interference with other wireless channels can be reduced, and as a result, the transmission capacity (total processing capacity) per unit time can be increased. On the other hand, when the transmission power of the data signal is at the upper limit When the value is lower than the value, the transmission speed of the data signal is controlled to increase. This control can achieve high-speed data transmission. As a result, it is possible to suppress the deterioration of communication quality and realize high-speed data communication.

In the computing device of the radio control device, preferably, the computing means computes the transmission power of the data signal based on an average value of the transmission power of the control signal within a predetermined time and an average value of the offset value within a predetermined time.

In the calculation step in the mobile communication method, preferably, in the calculation step, the data is calculated based on an average value within a predetermined time of the transmission power of the control signal and an average value within a predetermined time of the offset value. The sending power of the signal.

In the calculation processing executed by the mobile communication program, preferably, in the calculation processing, the data is calculated based on an average value of the transmission power of the control signal within a predetermined time and an average value of the offset value within a predetermined time. The sending power of the signal.

According to these inventions, the transmission power of the data signal is calculated from the average value of the transmission power of the control signal and the average value of the offset value. Thereby, the transmission speed of the data signal can be controlled based on the highly accurate transmission power which minimizes the influence of the transmission power and/or the fluctuation of the offset value due to sudden communication environment changes.

In addition, it is preferable that the radio control device further includes a method for calculating a data signal when the transmission speed of the data signal is lowered when the transmission power of the data signal is greater than the upper limit value based on the comparison result of the comparison means. The low-speed transmission power calculation unit of the transmission power, wherein the control unit performs control to decrease the transmission speed of the data signal until the transmission power of the data signal calculated by the low-speed transmission power calculation unit falls below the upper limit value.

In addition, in the mobile communication method, it is preferable to further include: based on the comparison result in the comparison step, when the transmission power of the data signal is greater than the upper limit value, the wireless control device calculates the transmission speed of the data signal. A low-speed transmission power calculation step of the transmission power of the data signal at the time of falling; in the control step, before the transmission power of the data signal calculated in the low-speed transmission power calculation step becomes equal to or less than the upper limit value, the data signal The control of the transmission speed drop.

In addition, it is preferable that the mobile communication program further executes calculation of the power of the data signal when the transmission speed of the data signal is lowered when the transmission power of the data signal is greater than the upper limit value based on the comparison result of the comparison process. In the low-speed transmission power calculation process of transmission power, in the control process, the transmission speed of the data signal is decreased until the transmission power of the data signal calculated by the low-speed transmission power calculation process is equal to or below the upper limit value.

According to these inventions, the data signal transmission speed is controlled so that the transmission power of the data signal is not more than the upper limit value. Then, when the transmission power of the data signal becomes equal to or lower than the upper limit value, the control for reducing the transmission speed of the data signal is stopped. Therefore, when the transmission speed of the data signal is lowered in order to maintain the communication quality, the transmission speed does not drop more than necessary. As a result, data transmission can be performed while suppressing a drop in transmission speed while maintaining communication quality.

Furthermore, it is preferable that the radio control device further includes a method for calculating, based on the comparison result of the comparison means, a data signal when the transmission power of the data signal is lower than the upper limit value, and the transmission speed of the data signal is increased. The high-speed transmission power calculation part of the transmission power of the above-mentioned control part, before the transmission power of the data signal calculated by the above-mentioned high-speed transmission power calculation part becomes the maximum value within the range of not exceeding the above-mentioned upper limit value, the above-mentioned data signal is adjusted. Control of transmission speed increase.

Furthermore, in the mobile communication method, it is preferable that the wireless control device calculates the data signal in the case where the transmission power of the data signal is smaller than the upper limit value based on the comparison result in the comparison step. In the high-speed transmission power calculation step of the transmission power of the data signal when the transmission speed is increased; in the above-mentioned control step, the transmission power of the data signal calculated in the high-speed transmission power calculation step is changed within the range not exceeding the above-mentioned upper limit value Before reaching the maximum value, control is performed to increase the transmission speed of the above-mentioned data signal.

Furthermore, it is preferable that the mobile communication program further executes calculation of a data signal when the transmission speed of the data signal is increased based on the comparison result of the comparison process, and when the transmission power of the data signal is smaller than the upper limit value. In the high-speed transmission power calculation process of the transmission power, in the above-mentioned control process, before the transmission power of the data signal calculated by the above-mentioned high-speed transmission power calculation process becomes the maximum value within the range not exceeding the above-mentioned upper limit value, the above-mentioned data signal is executed. The processing that the transmission speed of the signal increases.

According to these inventions, the data signal transmission speed is controlled to be the maximum value within the allowable range of the transmission power of the data signal. Therefore, data transmission can be performed at the highest transmission speed within the range in which the communication quality can be maintained. As a result, the total processing capacity can be increased more easily.

In addition, if the computer-readable recording medium on which the above-mentioned mobile communication program is recorded is sold or distributed individually or as an accessory, the mobile communication technology of the present invention can be widely and inexpensively implemented. Furthermore, it is also possible to include the wireless control device described in technical solution 1; and the base station, controlled by the control part of the wireless control device, to transmit the data signal to the mobile communication terminal at the transmission speed of the data signal, in the above wireless control Mobile communication system operation for communication between the device and the above-mentioned base station.

Description of drawings

FIG. 1 is a conceptual diagram showing an example of the overall configuration of a mobile communication system according to the present invention.

Fig. 2 is a schematic diagram for explaining the functional configuration of the mobile communication system.

FIG. 3A is a diagram showing an example of data storage inside a transmission power storage unit,

FIG. 3B is a diagram showing an example of data storage inside the maximum transmission-permissible power storage unit.

FIG. 3C is a diagram showing an example of data storage inside the initial offset value storage unit.

Fig. 4 is a flowchart for explaining DSCH transmission rate control processing.

FIG. 5 is a flowchart for explaining DSCH transmission rate reduction processing.

Fig. 6 is a flowchart for explaining DSCH transmission rate increase processing.

Fig. 7 is a configuration diagram of a recording medium storing the program of the present invention.

Detailed ways

One embodiment of the present invention will be described in detail below with reference to the drawings.

First, the configuration will be described. FIG. 1 is a schematic diagram showing the overall configuration of a mobile communication system 100 in this embodiment. As shown in Figure 1, a mobile communication system 100 has a switch 1 functioning as a relay point for public base stations; a wireless control device 2 for overall control of packet communications between public base stations and mobile phones; The public base stations 31, 32, 33 for mobile phones to directly perform wireless communication; the mobile phones 41, 42, 43 (corresponding to mobile communication terminals) carried by users... form a ladder, connected to be bidirectional Communication constitutes.

As a premise of the description, it is assumed that the mobile communication system 100 transmits a plurality of signals with different characteristics in the downlink wireless link from the public base station to the mobile phone (hereinafter referred to as "downlink link"), using two types of channels. That is, when sending When a control signal that requires relatively small transmission power is used, the downlink channel (hereinafter referred to as "A-DPCH") allocated to each mobile phone is used. On the contrary, when transmitting data that requires a large transmission power and requires high speed When the signal is transmitted, the shared channel (hereinafter referred to as "DSCH") is time-shared among multiple mobile phones.

Hereinafter, the internal configuration of the wireless control device 2 will be described in detail with reference to FIG. 2 . FIG. 2 is a block diagram showing the functional configuration of the wireless control device 2 . As shown in Figure 2, the wireless control device 2 is composed of a call reception control unit 21, a storage unit 22 (corresponding to a storage device), a transmission speed control unit 23 (corresponding to a calculation device, a comparison device, a control device, a low-speed transmission power calculation device, and a high-speed transmission power calculation device), a queue processing unit 24, and an A-DPCH transmission power monitoring unit 25, and each unit is connected by a bus. The arrows in the figure indicate the direction in which the signal is sent. The dotted lines indicate that the signals are control signals, and the solid lines indicate that they are data signals. Hereinafter, each constituent element will be described in detail.

The call reception control unit 21 monitors the mobile phones 41, 42, 43... from which mobile phones have call requests and switching requests to determine whether they can be received. When the reception is permitted, a wired line is set up with the exchange 1 while securing a user data buffer for the mobile phone that permits the reception. Simultaneously, the call reception control unit 21 forms and initializes a data storage area for mobile phones that have permitted reception in the transmission power storage unit 221 of the storage unit 22 described later.

The storage unit 22 includes a transmission power storage unit 221 , a maximum allowable transmission power storage unit 222 , and an initial offset value storage unit 223 . Hereinafter, an example of data storage inside the storage unit 22 will be described in detail with reference to FIGS. 3A to 3C .

As shown in FIG. 3A, the transmission power storage unit 221 has a terminal ID storage area 221a, a transmission speed storage area 221b, a transmission power storage area 221c, and an offset value storage area 221h inside. The terminal ID storage area 221a stores, as "terminal ID", numerical data (for example, "1", "2", . . . , "N") uniquely assigned to identify a mobile phone. The transmission speed storage area 221b uses numerical data (for example, "256", "128", ... "64") representing the transmission speed (unit: kbps) of data at time t using DSCH as "transmission speed". Speed" is stored and can be updated successively to the latest value.

The transmission power storage area 221c is a data storage area that stores the transmission power (in dBm) of the A-DPCH that changes over time as a history. In order to be able to set such a storage form, the transmission power storage area 221c has a time (t-k) data storage area 221d, a time (t-k+1) data storage area 221e, ..., a time t data storage area inside the transmission power storage area 221c. Area 221f, average value storage area 221g.

Specifically, the time (t-k) data storage area 221d records the transmission power of the A-DPCH obtained from the current time t to the time before k time (for example, "23", "25", ... "24") area. k is, for example, 200 to 300 ms. Similarly, the time (t-k+1) data storage area 221e is to record the transmission power of A-DPCH (for example, "26", "23", . ....."23"). Also, the time t data storage area 221f is an area for recording A-DPCH transmission power (for example, "23", "27", . . . "25") acquired at time t (now).

The average value storage area 221g is for recording the average value (for example, “24”, “25”, . area. Furthermore, in actuality, the average value storage area 221g stores the average value of all the corresponding data from time (t-k) to time t in the transmission power of A-DPCH corresponding to each terminal ID, but for the sake of simplicity, it is assumed that 3 average of the data.

In addition, the offset value storage area 221h is a data storage area that stores the offset value (unit: dB) that changes over time according to history. The value of the transmission power addition (addition, multiplication, etc.). The offset value changes with time according to the receiving error rate of the mobile communication terminal. Generally, the higher the transmission speed of the DSCH, the larger the offset value, and the higher the transmission speed of the DSCH. The lower the value, the smaller. In addition, the offset value is smaller when the wireless line status is better, and larger when the wireless line status is worse.

In order to realize the above-mentioned various storage forms, the offset value storage area 221h has a time (t-k) data storage area 221i, a time (t-k+1) data storage area 221j, ..., time t data inside. Storage area 221k, average value storage area 221l.

Specifically, the time (t-k) data recording area 221i is used to record offset values (for example, "11.0", "9.7", ... "4.5") obtained from the current time t to the time before k time. area. Similarly, the time (t-k+1) data storage area 221j is to record the offset value obtained from the current time t to the time before k-1 time (eg, "13.3", "11.5"..." 4.3") area. Also, the time t data storage area 221k is an area for recording offset values (for example, “13.2”, “9.4”, . . . “7.1”) acquired at time t (now).

The average value storage area 2211 is an area for recording the average value (for example, "12.5", "10.2", . . . "5.3") of offset values in time k from time (t-k) to time t. In addition, in fact, the average value storage area 2211 stores the average value of all corresponding data from time (t-k) to time t within the offset value corresponding to each terminal ID, but for the sake of simplicity, it is assumed that three data average of.

As shown in FIG. 3B , allowable maximum transmission power storage section 222 stores numerical data (for example, "36.0") indicating an upper limit value of DSCH transmission power (unit: dBm) as "allowable maximum transmission power". The allowable maximum transmission power may use a common value for the public base stations 31, 32, 33, . . . , or may be set independently for each public base station according to the communication environment.

The initial offset value storage unit 223 stores the initial value of the offset value in correspondence with the DSCH transmission rate. As shown in FIG. 3C , the initial offset value storage unit 223 has a transmission speed storage area 223 a and an initial offset value storage area 223 b inside. The transmission rate storage area 223a stores numerical data (for example, "384", "256", "128", and "64") indicating the transmission rate (unit: kbps) of data using the DSCH step by step as "transmission rate". The offset value storage area 223b stores numerical data (for example, "16.0", "13.0", "10.0") indicating an offset value (in dB) added to the transmission power of the A-DPCH at the start of communication and when the transmission rate is changed. ", "7.0") is stored as the "initial offset value".

Returning to FIG. 2 , the transmission rate control unit 23 calculates the transmission power of the DSCH based on the transmission power of the A-DPCH and the offset value, and determines the transmission rate of the DSCH based on the calculated transmission power of the DSCH. Then, the public base stations 31, 32, and 33 are instructed to transmit data signals at the determined transmission rate via the queue processing unit 24 described later. Also, transmission rate control section 23 calculates the average value of the transmission power of the A-DPCH and the average value of the offset value based on the data stored in transmission power storage section 221 .

The queue processing unit 24 acquires the transmission rate of the DSCH from the transmission rate storage area 221b, and extracts the data capacity (for example, the number of packets) corresponding to the acquired transmission rate from the user data buffer memory. Queue processing unit 24 transfers transmission data to DSCH transmission unit 312 of public base station 31 described later, and instructs data transmission to mobile phone 41 . Also, the queuing processing unit 24 notifies the public base station 31 of the offset value added to the transmission power of the A-DPCH.

A-DPCH transmission power monitoring unit 25 regularly monitors A-DPCH transmission power between public base station 31 and cellular phones 41 , 42 , 43 , . . . , which will be described later. Then, the monitoring result is recorded in the transmission power storage area 221c formed inside the transmission power storage unit 221 and corresponding to the terminal ID of each mobile phone. Since the numerical data indicating the transmission power of A-DPCH is sequentially updated simultaneously with the monitoring, the latest transmission power for each mobile phone is always recorded in the transmission power storage area 221c.

The composition of the public base station 31 at least includes: an A-DPCH sending unit 311 that uses the A-DPCH as a communication channel to send signals; a DSCH sending unit 312 that uses the DSCH to send signals in time division; and uses the DPCH of the uplink channel as a communication channel to receive signals The DPCH receiving unit 313.

The A-DPCH transmitting unit 311 transmits a control signal notifying the mobile phone 41 in advance of transmitting a data signal using the A-DPCH. Since the control signal is sent before the data is transferred, the mobile phone 41 can recognize the meaning of the data signal before it is received. Thereby, the public base station 31 can arbitrarily change the mobile phone that is the data transmission destination. Furthermore, as the transmission speed of the control signal, a fixed speed prescribed by a communication carrier or a standardization body is used.

The DSCH sending unit 312 establishes a DSCH between the mobile phone and the mobile phone only when the A-DPCH sending unit 311 sends a control signal, and uses the DSCH to send a data signal. The transmission speed of the data signal can be specified in each standardized specification. The time (for example, 10ms) is changed and determined variably. As will be described in detail later, DSCH transmission section 312 determines the transmission power of DSCH by adding the offset value specified by queue processing section 24 to the transmission power of A-DPCH.

DPCH receiving section 313 receives a command for controlling transmission power of DPCH from mobile phone 4-1. The transmission power of the A-DPCH between the public base station 31 and the mobile phone 41 is optimally controlled by this control command.

The mobile phone 41 is a well-known mobile phone, so detailed description is omitted, but at least includes an A-DPCH receiving unit 411 , a DSCH receiving unit 412 , and a DPCH transmitting unit 413 . The A-DPCH receiving unit 411 receives a control signal from the A-DPCH transmitting unit 311 of the public base station 31 . DSCH receiving section 412 starts reception of the data signal from DSCH transmitting section 312 of public base station 31 when receiving a notification of sending a data signal in advance through a control signal. The DPCH transmitting unit 413 transmits a control command for optimally controlling the transmission power of the A-DPCH, and transmits the A-DPCH to the public base station 31 as a communication channel.

Above, the configuration of each terminal device constituting the mobile communication system 100 of the present invention has been described, but the public base stations 32, 33, ... and the mobile phones 42, 43 ... shown in FIG. The main configuration is the same as that of the public base station 31 and the mobile phone 41 described in detail separately, so illustration and detailed description of the configuration will be omitted. That is, the public base stations 32 and 33 respectively include A-DPCH sending units 321 and 331 , DSCH sending units 322 and 332 , and DPCH receiving units 323 and 333 . In addition, the mobile phones 42 and 43 respectively include: A-DPCH receiving units 421 and 431 , DSCH receiving units 422 and 432 , and DPCH sending units 423 and 433 .

Hereinafter, operations in this embodiment will be described with reference to FIGS. 4 to 6 . Hereinafter, special attention is paid to the case where a mobile phone 41 (terminal ID is 1) within the communication area of the public base station 31 has a call request. The invention is not limited to transfer speed control techniques between these devices.

FIG. 4 is a flowchart for explaining DSCH transmission rate control processing executed by the radio control device 2 . First, in S1, the transmission rate control section 23 acquires the average value of the transmission power of the A-DPCH corresponding to the terminal ID "1" from the average value storage area 221g. The transfer rate control section 23 acquires the average value O of the offset values corresponding to the terminal ID "1" from the average value storage area 221l. The transmission rate control section 23 calculates the transmission power P of the DSCH from the average value A of the transmission power of the A-DPCH and the average value O of the offset values obtained. For example, in the case of the transmission rate control process between the mobile phone 41 and the public base station 31, the average value A of the transmission power of A-DPCH is 24dBm, and the average value O of the offset value is 12.5dB, so the transmission power of DSCH is calculated to be 36.5dBm of their sum.

In the present embodiment, since the average value A of the transmission power of the A-DPCH and the average value O of the offset value are expressed logarithmically, the transmission power of the DSCH can be calculated by addition processing. When the average value A of the transmission power of the A-DPCH and the average value O of the offset value are real numbers, the transmission power of the DSCH may be calculated by multiplication processing.

The reason for calculating the transmission power of the DSCH by adding an offset value to the transmission power of the A-DPCH is as follows. That is, the transmission power of the A-DPCH is often optimized based on the control command transmitted from the mobile phone 41 to the public base station 31 as described above. ground control. On the other hand, when the mobile phone 41 receives a signal from the public base station 31, A-DPCH and DSCH are used at the same time because other diffusion symbols are used, so in communication using code division multiplexing, A-DPCH and DSCH The radio channel status of DSCH can be considered to be the same. Therefore, the transmission power of DSCH is determined in conjunction with the transmission power of A-DPCH by adding a numerical value (offset value) to the transmission power of A-DPCH.

In S2 , the transmission rate control unit 23 acquires the allowable maximum transmission power T from the allowable maximum transmission power storage unit 222 . Next, the transmission rate control section 23 compares the DSCH transmission power P calculated in S1 with the allowable maximum transmission power T acquired in S2 ( S3 ).

As a result of this comparison process, when the transmission power P of the DSCH is greater than the allowable maximum transmission power (that is, in the case of P>T), the transmission rate control unit 23 determines that the current transmission power of the DSCH is too large, and starts to reduce the transmission power of the DSCH. The processing of the transmission speed (S4). Conversely, in S3, when the transmission power P of the DSCH is equal to or less than the allowable maximum transmission power T (that is, the case of P≦T), the transmission rate control unit 23 judges that the current transmission power of the DSCH is equal to or less than the upper limit value, There is a possibility of increasing the DSCH transmission rate, and the DSCH transmission rate increase process is started (S5). With the end of the processing in S4 or S5, a series of DSCH transmission rate control processing ends.

Hereinafter, the DSCH transmission rate reduction process shown in S4 will be described in detail with reference to FIG. 5 . First, in S41, the transmission rate control section 23 acquires the current (time t) transmission rate R of the DSCH from the transmission rate storage area 221b.

Next, the transmission rate control section 23 acquires the initial offset value Oi when the transmission rate R of the DSCH obtained in S41 is lowered by one stage from the initial offset value storage area 223b (S42). For example, in the case of the transmission rate control process between the mobile phone 41 and the public base station 31, the transmission rate of the DSCH at time t is 256 kbps. Accordingly, the transmission rate control unit 23 acquires 10 dB as an initial offset value corresponding to a transmission rate of 128 kbps, which is one step lower than 256 kbps.

In the following S43, the transmission rate control section 23 acquires the average value A of the transmission power of the A-DPCH corresponding to the terminal ID "1" of the mobile phone 41 from the average value storage area 221g. The transmission rate control section 23 calculates the transmission power P' of the DPCH from the acquired average value A of the transmission power of the A-DPCH and the initial offset value Oi acquired in S42. For example, in the case of the transmission rate control process between the mobile phone 41 and the public base station 31, the average value A of the transmission power of the A-DPCH is 24dBm, since the initial offset value obtained in S42 is 10dB, the DSCH The transmit power is calculated to be 34dBm.

In S44, the transmission rate control section 23 compares the DSCH transmission power P' calculated in S43 with the allowable maximum transmission power T acquired in S2 of FIG. 4 . As a result of this comparison process, when the transmission power P' of the DSCH is larger than the allowable maximum transmission power T (that is, the case of P'>T), the transmission rate control unit 23 judges that the transmission power of the DSCH is still too large. value, the transmission rate of DSCH is further set to a lower level (S45).

After the end of S45, the transmission rate control unit 23 returns to step S41 again to execute the processing after S41 in order to confirm whether the transmission rate of the DSCH needs to be lowered further. In S41, the transmission rate of the DSCH set in S45 is acquired as the current transmission rate R of the DSCH. A series of processes from S41 to S45 are repeatedly executed until the comparison result in S44 satisfies P'≤T.

On the other hand, in S44, when the transmission power P' of the DSCH is equal to or less than the allowable maximum transmission power T (that is, when P'≦T), the transmission rate control section 23 determines that the transmission power of the DSCH is within the allowable range. The DSCH transmission rate is decreased until the currently set DSCH transmission rate is reached (S46).

The lowered DSCH transmission rate is updated and stored in the transmission rate storage area 221b corresponding to the terminal ID "1". In addition, the initial offset value corresponding to the lowered DSCH transmission rate is updated as the current offset value Stored in the time t data storage area 221k. After S46 ends, a series of DSCH transmission speed control processing ends.

Next, the DSCH transmission rate increase process shown in S5 will be described in detail with reference to FIG. 6 . First, in S51, the transmission rate control section 23 acquires the current (time t) transmission rate R of the DSCH from the transmission rate storage area 221b.

Next, the transmission rate control section 23 acquires the initial offset value Oi when the transmission rate R of the DSCH acquired in S51 is increased by one level from the initial offset value storage area 223b (S52). For example, in the case of the transmission rate control process between the mobile phone 41 and the public base station 31, the transmission rate of the DSCH at time t is 256 kbps. Accordingly, the transmission speed control unit 23 acquires 16 dB corresponding to the transmission speed of 384 kbps, which is one step higher than 256 kbps, as an initial offset value.

In the following S53, the transmission rate control section 23 acquires the average value A of the transmission power of the A-DPCH corresponding to the terminal ID "1" of the mobile phone 41 from the average value storage area 221g. The transmission rate control unit 23 calculates the transmission power P" of the DSCH from the obtained average value A of the transmission power of the A-DPCH and the initial offset value Oi obtained in S52. For example, when the mobile phone 41 and the public base station 31 In the case of the inter-transmission rate control processing, the average value A of the transmission power of A-DPCH is 24dBm, and since the initial offset value obtained in S52 is 16dB, the transmission power of DSCH is calculated to be 40dBm.

In S54, the transmission rate control unit 23 compares the DSCH transmission power P" calculated in S53 with the allowable maximum transmission power T acquired in S2 of FIG. 4 . As a result of this comparison, when the DSCH transmission power P" When the allowable maximum transmission power T is lower than the allowable maximum transmission power T (that is, the case of P"≤T), the transmission rate control unit 23 determines that the transmission power of the DSCH is within the allowable range even if the transmission rate of the DSCH is increased by one stage, and sets The transmission rate of DSCH is set one level higher (S55).

After S55 ends, the transmission rate control unit 23 returns to step S51 again to execute the processing after S51 in order to confirm whether the transmission rate of the DSCH can be further increased. In S51, the transmission rate of the DSCH changed in S55 is acquired as the current transmission rate R of the DSCH. A series of processes from S51 to S55 are repeatedly executed until the comparison result in S54 satisfies P">T.

On the other hand, in S54, when the transmission power P" of the DSCH is greater than the allowable maximum transmission power T (that is, the case of P">T), the transmission rate control section 23 determines that the transmission power of the DSCH exceeds the allowable range. And move to the processing of S56. In S56, the transmission rate control section 23 increases the transmission rate of the DSCH up to the transmission rate next to the currently set DSCH transmission rate (S56).

The reason for lowering the level of raising the transmission rate of DSCH by one level from the current setting is as follows. That is, the DSCH transmission rate set at the time of executing the process of S56 is a value exceeding the allowable maximum transmission power T as a result of increasing the DSCH transmission rate. Therefore, the value before exceeding the allowable maximum transmission power T is equal to or less than the allowable maximum transmission power T, and is the maximum transmission speed within the allowable range.

The increased transmission rate of the DSCH is updated and stored in the transmission rate storage area 221b corresponding to the terminal ID "1". In addition, the initial offset value corresponding to the increased DSCH transmission rate is updated and stored in the time t data storage area 221k as the current offset value. After S56 ends, a series of DSCH transmission rate control processing ends.

As described above, according to the mobile communication system 100 in this embodiment, the wireless control device 2 has the transmission rate control unit 23 and the storage unit 23. The transmission rate control unit 23 transmits power based on the control signal transmitted to the mobile phone 41, and The offset value added to the transmission power of the control signal is used to calculate the transmission power of the data signal sent to the mobile phone 41. The transmission speed control unit 23 compares the transmission power of the data signal with the upper limit value stored in the storage unit 22, and when the data signal When the transmission power is greater than the upper limit value, control is performed to reduce the transmission speed of the data signal. Through this control, the wireless control device 2 can supply sufficient transmission power suitable for the transmission speed to the DSCH, thereby improving the communication quality of the data. .Thereby, the retransmission rate caused by transmission errors and the interference to other wireless lines can be reduced, and as a result, the transmission data capacity per unit time can be increased. On the other hand, the transmission power of the wireless control device 2 is at the upper limit. In the following cases, control is performed to increase the transmission speed of the data signal. Through this control, the wireless control device 2 can increase the speed of data transmission. As a result, it is possible to suppress the deterioration of communication quality and realize high-speed data communication.

Preferably, the transmission rate control unit 23 calculates the transmission power of the data signal based on the average value of the transmission power of the control signal over a predetermined time and the average value of the offset value over a predetermined time. Thus, the radio control device 2 can control the transmission rate of the data signal based on highly accurate transmission power that minimizes the influence of transmission power due to sudden communication environment changes or fluctuations in offset values.

More preferably, the transmission rate control section 23 calculates the transmission power of the data signal when the transmission rate of the data signal is lowered when the transmission power of the data signal is higher than the upper limit value. The transmission rate control unit 23 performs control to decrease the transmission rate of the data signal until the calculated transmission power of the data signal becomes equal to or lower than an upper limit value. Then, when the transmission power of the data signal becomes equal to or lower than the upper limit value, the control for reducing the transmission speed of the data signal is stopped. Therefore, when the transmission speed of the data signal is lowered in order to maintain the communication quality, the transmission speed will not be lowered more than necessary. As a result, it is possible to suppress a decrease in transmission speed while maintaining communication quality.

More preferably, the transmission rate control section 23 calculates the transmission power of the data signal when the transmission rate of the data signal is increased when the transmission power of the data signal is equal to or less than an upper limit value. The transmission rate control unit 23 performs control to increase the transmission rate of the data signal until the calculated transmission power of the data signal reaches the maximum value within the range not exceeding the upper limit value. Therefore, data transmission can be performed at the highest transmission speed within the range in which the communication quality can be maintained. As a result, it becomes easier to increase the total processing capacity.

In addition, the aspect described in this embodiment is a suitable example of the mobile communication system of the present invention, but is not limited thereto. For example, in this embodiment, from the viewpoint of the reliability of the calculation results, the transmission power of the DSCH is calculated using the average value of the transmission power of the A-DPCH and the average value of the offset value. However, at least one of the transmission power of the A-DPCH and the offset value may be an instantaneous value. Thereby, the process of calculating the average value by the transfer rate control unit 23 can be omitted, and the processing load can be reduced. In addition, it is possible to save a data area for storing transmission power and offset values obtained in the past.

In this embodiment, the mobile communication terminal is described as a mobile phone, but for example, an information device having a wireless communication function such as a PDA (Personal Digital Assistance) may be used.

Furthermore, in the above-mentioned embodiment, an example in which the transmission rate of the data signal is controlled by the transmission rate control unit 23 in the wireless control device 2 has been described, but the transmission rate of the data signal may be controlled by the public base station 31 . In this case, the public base station 31 further has the functions of the above-mentioned storage means, transmission rate control means, part of the queue processing means (control signal input and output functions), and A-DPCH transmission power monitoring means.

With such a configuration, since the mobile communication system 100 executes a series of processes from A-DPCH transmission power acquisition to DSCH transmission rate control and data transmission inside the public base station 31, there is no need to communicate between the wireless control device 2 and the public. Since control signals are transmitted and received between the base stations 31, regardless of the line distance between the wireless control unit 2 and the public base station 31, the response characteristic of the transmission speed control can be maintained.

Finally, the mobile communication program according to the embodiment of the present invention and the computer-readable recording medium (hereinafter, simply referred to as "recording medium") on which the mobile communication program is recorded will be described. Here, the recording medium refers to A reading device installed in a hardware resource such as a general-purpose computer can cause a magnetic, optical, electrical, etc. energy change state corresponding to the recorded content of the program, and can transmit the description of the program to the reading device in the form of a signal corresponding to it Content media. As such recording media, for example, in addition to media that can be loaded and removed from computers such as magnetic disks, optical disks, and optical disks, there are also HD (Hard Disk) that is fixedly built into the computer and fixed Non-volatile semiconductor storage such as integrated firmware, etc.

FIG. 7 is a configuration diagram of a recording medium according to an embodiment of the present invention. The recording medium 50 is provided with the program storage area 50a which records a program, as shown in FIG. A mobile communication program 51 is recorded in the program recording area 50a. The mobile communication program 51 is a program for controlling packet communication in the downlink direction between the mobile phone and the public base station, and its composition includes: a main module 51a that always executes processing; The transmission power of the control signal of the terminal, and the offset value added to the transmission power of the control signal, calculate the transmission power calculation module 51b of the transmission power of the data signal sent to the above-mentioned specific mobile communication terminal; An upper limit value storage module 51c whose upper limit value is stored in the storage device; a transmission power comparison module 51d that compares the calculated transmission power of the data signal with the upper limit value stored in the storage device; Control of reducing the transmission speed of the data signal when the transmission power of the data signal is greater than the upper limit value, and increasing the transmission speed of the data signal when the transmission power of the data signal is below the upper limit value The transmission speed control module 51e.

Preferably, the configuration of the mobile communication program 51 includes: based on the result of the comparison, when the transmission power of the data signal is greater than the upper limit value, calculating the power of the data signal when the transmission speed of the data signal is reduced. Low-speed transmission power calculation module 51f of transmission power; based on the result of the comparison, when the transmission power of the data signal is below the upper limit, calculate the high-speed transmission power of the data signal when the transmission speed of the data signal is increased. Send power calculation module 51g.

Here, the upper limit value storage module 51c is a module for storing the same data as the data stored in the storage unit 22 of the wireless control device 2 in a storage device such as an HD or a memory. In addition, the functions realized by operating the transmission power calculation module 51b, the transmission power comparison module 51d, the transmission speed control module 51e, the low-speed transmission power calculation module 51f, and the high-speed transmission power calculation module 51g, and the transmission power provided by the wireless control device 2 The function of the speed control unit 23 is the same.

The mobile communication program 51 may be configured by receiving a part or all of it from another device via a transmission medium such as a communication line, and recording it by a computer's communication unit. On the contrary, the configuration may be another device that transmits the mobile communication program 51 via a transmission medium and installs it.

According to the present invention, according to the transmission power of the control signal transmitted to each of the plurality of mobile communication terminals using an independent channel, the transmission of the data signal transmitted by time division is dynamically controlled using the common channel among the plurality of mobile communication terminals speed. That is, when the transmission power of the data signal is greater than the upper limit value, control is performed to reduce the transmission speed of the data signal. Through this control, sufficient transmission power suitable for the transmission speed can be supplied to the DSCH, and the communication quality of data can be improved. On the other hand, when the transmission power of the data signal is equal to or less than the upper limit value, control is performed to increase the transmission speed of the data signal. This control can increase the speed of data transfer. As a result, it is possible to suppress a decrease in communication quality and realize high-speed data communication.

Claims (9)

1. A wireless control device for total control of packet communications between public base stations and mobile terminals, characterized in that it comprises: The first storage unit stores, for each of the plurality of mobile communication terminals, the transmission power of the control signal transmitted to the mobile communication terminal and an offset value added to the transmission power of the mobile communication terminal; The calculation means acquires the transmission power of the control signal transmitted to the specific mobile communication terminal and the offset value added to the transmission power of the control signal from the first storage means in the plurality of mobile communication terminals, and based on the obtained The transmission power and the offset value are used to calculate the transmission power of the data signal sent to the above-mentioned specific mobile communication terminal; The second storage unit stores the transmission power upper limit value of the above-mentioned data signal; a comparison unit for comparing the transmission power of the data signal calculated by the calculation unit with the upper limit value stored in the second storage unit; and The control unit performs the following control based on the comparison result of the comparison unit: when the transmission power of the data signal is greater than the upper limit value, the transmission speed of the data signal is reduced; When the limit value is still small, the transmission speed of the above-mentioned data signal is increased. 2. The wireless control device according to claim 1, characterized in that: The calculating means calculates the transmission power of the data signal based on the average value of the transmission power of the control signal within a predetermined time and the average value of the offset value within a predetermined time. 3. The wireless control device according to claim 1, further comprising: The low-speed transmission power calculation unit calculates the transmission power of the data signal when the transmission speed of the data signal is lowered when the transmission power of the data signal is larger than the upper limit value based on the comparison result of the comparison means, The control means performs control to decrease the transmission speed of the data signal until the transmission power of the data signal calculated by the low-speed transmission power calculation means falls below the upper limit value. 4. The wireless control device according to claim 1, further comprising: The high-speed transmission power calculation unit calculates the transmission power of the data signal when the transmission speed of the data signal is increased when the transmission power of the data signal is smaller than the upper limit value based on the comparison result of the comparison unit, The control means controls to increase the transmission speed of the data signal until the transmission power of the data signal calculated by the high-speed transmission power calculation means reaches a maximum value within a range not exceeding the upper limit value. 5. A mobile communication method carried out by a wireless control device which generally controls packet communication between public base stations and mobile terminals, characterized in that it comprises: In the first storage step, for each of the plurality of mobile communication terminals, the wireless control device stores, in the first storage unit of the wireless control device, the transmission power of the control signal transmitted to the mobile communication terminal, and the transmission power for the mobile communication terminal The offset value attached to the sent power of ; In the calculation step, the wireless control device acquires, from the first storage unit, the transmission power of the control signal to be transmitted to a specific mobile communication terminal and the offset value added to the transmission power of the control signal among the plurality of mobile communication terminals. , based on the obtained transmission power and the offset value, the wireless control device calculates the transmission power of the data signal sent to the specific mobile communication terminal; In a second storing step, the wireless control device stores the transmission power upper limit value of the data signal in a second storage unit of the wireless control device; a comparing step, wherein the wireless control device compares the transmission power of the data signal calculated in the calculating step with the upper limit value stored in the second storage means; and In the control step, based on the comparison result in the comparison step, the wireless control device lowers the transmission speed of the data signal when the transmission power of the data signal is greater than the upper limit value, and the transmission power of the data signal When it is smaller than the upper limit value, control is performed to increase the transmission speed of the data signal. 6. The mobile communication method according to claim 5, characterized in that: In the calculating step, the transmission power of the data signal is calculated based on an average value of the transmission power of the control signal within a predetermined time and an average value of the offset value within a predetermined time. 7. The mobile communication method according to claim 5, further comprising: In the low-speed transmission power calculation step, based on the comparison result in the comparison step, when the transmission power of the data signal is greater than the upper limit value, the wireless control device calculates the data signal when the transmission speed of the data signal is reduced. the transmission power, In the control step, the transmission speed of the data signal is controlled to decrease until the transmission power of the data signal calculated in the low-speed transmission power calculation step falls below the upper limit value. 8. The mobile communication method according to claim 5, further comprising: In the high-speed transmission power calculation step, based on the comparison result in the comparison step, when the transmission power of the data signal is smaller than the upper limit value, the wireless control device calculates data for increasing the transmission speed of the data signal. signal transmission power, In the control step, control is performed to increase the transmission speed of the data signal until the transmission power of the data signal calculated in the high-speed transmission power calculation step reaches the maximum value within the range not exceeding the upper limit value. 9. A mobile communication system, characterized in that it comprises: The wireless control device of claim 1; and The base station is controlled by the control unit of the wireless control device, and transmits the data signal to the mobile communication terminal at the transmission speed of the data signal, Communication is performed between the wireless control device and the base station.

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